I took Sunil's advice and added two other groups of medical words. (Had trouble with the Merriam Webster and it is copyrighted (trying to keep this legally shareable)
I have updated the userdic.tlx file on dropbox:
https://www.dropbox.com/sh/z1vxfny7khqr0kz/3bFTTRIA-I Let me know how it works for you.